LPC61W492QFP Ver la hoja de datos (PDF) - SMSC -> Microchip

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LPC61W492QFP

Integrated Super I/O Controller for LPC Bus with Game and MIDI Ports/Plus Hardware Monitoring Functions

SMSC -> Microchip 

FDC Interface

SYMBOL

PIN

I/O

FUNCTION

DRVDEN0

DRVDEN1

IRQIN1

1

OD24 Drive Density Select bit 0.

2

OD12 Drive Density Select bit 1.

IN

Alternate Function Input: Interrupt channel input.

GP27

nINDEX

I/OD12 General purpose I/O port 3 bit 6.

3

INcs This Schmitt-triggered input from the disk drive is active low

when the head is positioned over the beginning of a track

marked by an index hole. This input pin is pulled up

internally by a 1 K" resistor. The resistor can be disabled

by bit 7 of L0-CRF0 (FIPURDWN).

nMOA

4

OD24 Motor A On. When set to 0, this pin enables disk drive 0.

This is an open drain output.

nDSB

5

OD24 Drive Select B. When set to 0, this pin enables disk drive B.

This is an open drain output.

nDSA

6

OD24 Drive Select A. When set to 0, this pin enables disk drive A.

This is an open drain output.

nMOB

7

OD24 Motor B On. When set to 0, this pin enables disk drive 1.

This is an open drain output.

nDIR

8

OD24 Direction of the head step motor. An open drain output.

Logic 1 = outward motion

Logic 0 = inward motion

nSTEP

9

OD24 Step output pulses. This active low open drain output

produces a pulse to move the head to another track.

nWD

10

OD24 Write data. This logic low open drain writes pre-

compensation serial data to the selected FDD. An open

drain output.

nWE

nTRAK0

11

OD24 Write enable. An open drain output.

13

INcs Track 0. This Schmitt-triggered input from the disk drive is

active low when the head is positioned over the outermost

track. This input pin is pulled up internally by a 1 K"

resistor. The resistor can be disabled by bit 7 of L0-CRF0

(FIPURDWN).

nWP

14

INcs Write protected. This active low Schmitt input from the disk

drive indicates that the diskette is write-protected. This

input pin is pulled up internally by a 1 K" resistor. The

resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN).

nRDATA

15

INcs The read data input signal from the FDD. This input pin is

pulled up internally by a 1 K" resistor. The resistor can be

disabled by bit 7 of L0-CRF0 (FIPURDWN).

10

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